Chuck.



E. COOK.

CHUGK.

APPLICATION FILED AUG. 24, 1907.

2 SHEETS-SHEET 1.

' Patented Feb. 16, 1909.

mnntoz attoznu o i I if CHUCK.

APPLICATION FILED AUG. 24, 1907.

912,448, Patented Feb. 16, 1909.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFIOE.

EUGENE COOK, OF KALAMAZOO, MICHIGAN.

CHUCK.

Specification of Letters Patent.

Patented Feb. 16, 1909.

Application filed August 24, 1907. Serial No. 390,007.

' stated, in which the flat shank drills are adjustably supported;third, to provide an improved chuck whioh is simple in structure andvery durable, and one which may be quickly adjusted.

Further objects, and objects relating to details of construction, willdefinitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and meansdescribed in the following specification.

The invention is clearly defined and pointed out in the claims.

A structure embodying the features of my invention is clearlyillustrated in the accompanying drawing, forming a part of thisspecification, in which:

Figure 1 is a side elevation of a structure embodying the features of myinvention, parts being broken away to show the structural details; Fig.2 is a detail longitudinal section taken on a line corresponding to line22 of Fig. 1 Fig. 3 is a cross-section taken on a line corresponding toline 33 of Figs. 1 and 2; Fig. 4 is a crosssection taken on a linecorresponding to line 4- 1 of Fig. 1.

Fig. 5 is a detail longitudinal section corresponding to that of Fig. 2,a round shank drill being shown in position in the chuck; and Fig. 6 isa cross-section taken on a line corresponding to line 6 -6 of Fig. 5.

Referring to the drawing, the body 1 is chambered to receive the shankof the drill. It is provided at its outer end with longitudinaljaw-slots 2. The jaws 3 are arranged in these slots, as clearly appearsin the drawing, the jaws being provided with flat faces, each having alongitudinal central groove therein. The groove 5 of one of the jaws islarger than the groove 4 of the opposite jaw, the groove 5 being curvedin cross-section and of sufficient size to receive the round shank of adrill, as clearly appears in Figs. 5 and 6. The groove 5 is adapted toreceive the round shank 6 of the drill 7, as clearly appears in Figs. 5and 6. The groove 4 is adapted to receive the longitudinal rib 9 of thefiat drill 8, the opposite rib projecting into the groove 5 of theopposite jaw, so that the flat drill is clamped between the awe and iscentered and held against lateral movement by means of the rib 9entering the groove 4.

The jaws are provided with inwardlyprojecting rests, 10, which areadapted to engage suitable rest-lugs 11 on the flat shank drill,

preferably formed by notching the ribs 9. By this means the fiat shankdrill may be adjusted according to the length of the bit desired and asthe same is worn down. This is of advantage, as it has been foundpracticable to use flat-ribbed bars of l1ighspeed steel as drills, sothat the machining labor required in forming the same into a drill is reduced to a minimum, it only being necessary to prepare thecutting-point, which is of very great advantage as the difficulty inworking the so called high speed steel is wellknown.

The rests are adapted to engage the end of the round shank drill, asclearly appears in Fig. 5, the drill being centered by entering thecurved groove 5 of one of the jaws, as described, and is clampedthroughout the entire length of the jaws, the thrust being taken up bythe rest, as stated.

The aws are preferably provided with luglike projections 12 at theirinner ends, adapted to engage the body to limit their inward movementinto the body. This holds the shank rests in proper position andprevents 9 the jaws falling into the body, when the drill shank isremoved. The jaws are preferably tapered outwardly and provided with tapered heads or enlargements 13, adapted to rest on the outer end of thebody, these heads taking part of the thrust on the jaws and alsoproviding a conical surface on the jaws for engagement with theclamping-sleeve or nut 14. This clamping sleeve is provided with conicalor tapered portions 15 and 16 at its outer and inner ends respectively,the outer clamping portion being adapted to engage the heads orenlargements 13 of the aws and the inner portions of the bodies of thejaws. The sleeve is threaded upon the body, the

threaded portion 17 thereof being preferably 1 located between thetapered portions described. j

By thus forming and arranging the parts, they are very economical toproduce and at 1 the same time the structure is of great strength and isentirely effective for the purpose, it being adapted to adjustablysupport the flat shank provided with rest-engaging lugs, or toeffectivelysupport the round shank drill. The round shank drill is ofthe usual construction of drills now on the market.

The flat shank drill is especially adapted for my improved chuck byproviding the same with the rest-lugs 11. It is obvious that my improvedchuck may be adapted for supporting a fiat shank having longitudinal jribs without these stop lug features, although of course it would lackthe adjustable feature. By this means I am able to do away with more orless complicated features of chucks adapted to adjustable support drillsof this type.

I have illustrated and described my improved chuck in detail in the formpreferred by me on account of its simplicity and economy and conveniencein use. It is, however, capable of considerable variation in struc turaldetails, and as these will be readily understood by those skilled in theart to which this invention relates, I do not attempt to illustrate thesame herein.

Having thus described my invention, what I claimas new and desire tosecure by Letters Patent, is:

1. In a chuck, the combination with a chambered body having a pair oflongitudinal jaw slots in its outer end; a pair of jaws adapted toengage the shank of a'drill and receive the thrust thereof, said jawsbeing tapered and provided with enlargements at their outer ends adaptedto rest on the outer end of the body, their inner ends being adapted torest on the bottom of the said slots of said body and being providedwith body-engaging portions at their inner ends to limit their inwardmovement in the body; and a clamping sleeve having a conical jawengaging portion at each end thereof threaded upon said body, thethreads of said sleeve being located between the said conical portionthereof.

2. In a chuck, the combination with a chambered body having a pair oflongitudinal jaw-slots at its outer end; a pair of jaws adapted toengage the shank of a drill and 1 receive the thrust thereof, said jawsbeing tapered and provided with enlargements at their outer ends adaptedto rest on the outer end of the body, their inner ends being adapted torest on the bottom of the said slots of said body; and a clamping sleevehaving a conical jaw engaging portion at each end thereof threaded uponsaid body, the

threads of said sleeve being located between the said cc nical portionsthereof.

.3. In a chuck, the combination with a chambered body having pair oflongitudinal jaw slots in its outer end; a pair of jaws adapted toengage the shank of drill and receive the thrust thereof, said. jawsbeing provided with enlargements at their outer ends adapted to rest onthe outer end of the body, their inner ends being adapted to rest on thebottom of the said slots of said body and being provided withbody-engaging portions to limit their inward movement; and

means for adjusting said jaws.

4. In a chuck, the combination with a chambered body having a pair oflongitudinal jaw slots in its outer end; a pair of jaws adapted toengage the shank of a drill and receive the thrust thereof, said jawsbeing provided with enlargements at their outer ends adapted to rest onthe outer end of the body, their inner ends being adapted to rest on thebottom of the said slots of said body; and means for adjusting saidjaws.

5. In a chuck, the combination with the body, of a pair of jaws havingflat faces with central Longitudinal grooves therein and shank reststowards their inner ends arranged in alinernent with said grooveswhereby they are adapted to engage the end of a drill shank or rest lugsthereon to receive the thrust of the drill and means for adjusting saidjaws.

6. In a chuck, the combination of a chambered body; a pair of jaws,having longitudi nal grooves therein, the groove of one of the jawsbeing larger than the groove of the other, and curved in cross sectionto receive a round shank, and means for adjusting said aws.

In witness whereof, I have hereunto set my hand and seal in the presenceof two witnesses.

EUGENE COOK. a. 8.]

